OOGENESIS, SPERMATOGENESIS, ETC. Qeil. Sub . 67 
leucocytes ; Siedlecki (653). — In ovum of newt ; Braus (69). — In 
developing ova of Teleosteans ; Raffaele (546).— In early development 
of Teleosteans; Fusari (221). — Atypical mitoses; Jurgens (332). — 
Nuclear division in Euglena viridis ; Keuten (341). — Heterotypic 
nuclear divisions ; Farmer & Moore (187). — Multiple nuclear division, 
quite a normal occurrence, especially in highly-nourished cells : the 
nucleus may divide into from 2-20 parts, but always regularly ; Krom- 
pecher (365). — Nuclear division without cell division : Loeb (405). 
6. Oogenesis, Spermatogenesis, Maturation, Fertilisation. 
a. Ovum . 
Ovarian ova : structure of ; Crety (123). — Ovum of Amphioxus : 
minute description of ; Sobotta (662). — Oogenesis of Dytiscus ; Saint- 
Hilaire (611). — Oogenesis in Nemerteans ; Burger (88). — Oogenesis, 
&c., in Tomopteris ; Fullarton (220). — Ovum of hedgehog : amitotic 
division of germinal vesicle ; Floderus (208). — Polarisation of ova : 
“morphological,’’ “general,” and “special”; Roux (596). — Polarity in 
Echinoderm ovum ; Wilson & Mathews (762). — Isotropy of the germ 
is inconsistent with fact ; it is seolotropic, «.e., different along each 
radius ; Ryder (602). — Tarying degrees of isotropy in ova ; Nussbaum 
(495). — Nucleoli of lobster eggs fall by their own weight to the lower 
side of the nuclei ; Herrick (301). — Amitosis in ovaries of Hemiptera ; 
Preusse (537). — VitelliiiS nucleus in Salticus and Scutigera ; Bisogni 
(44). — Yolk-nuclous in Lumbricus - ovum consists of chromatin in 
granular form and is of nuclear origin; Calkins (92). — Abnormal 
fusion of ova in Ophryotrocha ; Korschelt (352). 
b. Spermatozoon. 
In Selachians ( Scyllium catuliis) nuclei of germinal band multiply 
amitotically and form plasmodial nests of germ-cells. Secondary nests 
formed by amitotic multiplication of the nuclei of the membrana propria 
of the testicular cavity, &c.; Sabatier (605). — In Elasmobranchs ; 
Moore (465). — Spermatogenesis of Caloptenus femur-rubrum, Orthoptera , 
and Cicada tibicen t Hemiptera ; Wilcox (758). — In the modification of 
spermatid into spermatozoon in Bufo vulgaris , the nucleus forms the head 
and middle portion, but the central corpuscle lengthens out to form the 
most important part of the tail ; Buhler (85). — In birds ; Moore (466). 
—Spermatogenesis of silkmoth; Toyama (695). — In Lumbricus \ Calkins 
(91). — In Copepods, Gryllotalpa and Salamander; vom Rath (556). 
— The cells of the earthworm’s testes, which arise directly from the peri- 
toneal covering, are Urkeimzellen ; all the rest are spermatogonia ; 
Erlanger (184). — Spermatogenesis in Telphusa fluviatilis very like that 
of crayfish, probably in part adaptive to similar conditions ; Mari (426). 
— Spermatogenesis, &c., in Tomopteris; Fullarton (220). — In earthworm: 
